Abstract
Aim
The aim of this experimental study was to histomorphometrically evaluate the effects of vitamin C administration on bone formation in response to expansion of the rat inter-premaxillary suture.
Materials and methods
A total of 30 50- to 60-day old Wistar male rats were divided into three groups of equal number. The inter-premaxillary suture in each animal was expanded with a 0.49 N force applied to the upper incisors. At 24 h after appliance placement, control animals received saline solution (group I) and two groups were given a single dose of vitamin C using two different methods [locally into the suture (group II) and systemically via intramuscular injection (group III)]. The area of new bone (µm2), the perimeter around the new bone (µm), Feret’s diameter (µm), and the percentage of new bone to non-ossified tissue (%) were measured and compared. Kruskal-Wallis and Tukey tests were used for statistical evaluation at the p<0.05 level.
Results
We observed significant differences among the groups in all histomorphometric parameters. New bone area, bone perimeter, Feret’s diameter, and percentage of new bone dimensions were significantly higher in group III than the others (p<0.001). Histomorphometric measurements of bone architecture revealed that this improved in the group administered with vitamin C systemically, while local injection revealed significantly less bone growth than the control group.
Conclusion
The systemic administration of vitamin C during the early stages of inter-premaxillary suture expansion may stimulate bone growth. However, local injection of this antioxidant into an orthopedically-expanded suture area has negative effects on bone formation.
Zusammenfassung
Ziel
Das Ziel dieser Versuchsstudie an Ratten bestand in der histomorphometrischen Bewertung der Wirkung von Vitamin-C-Gaben auf die Knochenneubildung nach Expansion der Sutura palatina mediana.
Material und Methodik
Dreißig männliche Wistar-Ratten im Alter von 50 bis 60 Tagen wurden in drei gleiche Gruppen eingeteilt. Bei allen Tieren wurde die Sutura palatina mediana durch die Applikation einer Kraft von 0,49 N auf die oberen Schneidezähne geweitet. Vierundzwanzig Stunden nach Einsetzen der Apparatur erhielt eine Kontrollgruppe der Tiere Salzlösung (Gruppe I) und zwei Versuchsgruppen wurden auf zwei verschiedenen Wegen [lokal in die Naht (Gruppe II) und systemisch durch intramuskuläre Injektion (Gruppe III)] mit einer einzelnen Dosis Vitamin C behandelt. Es wurden das neue Knochenareal (µm2), der Knochenumfang um den neuen Knochen (µm), der Feret-Durchmesser (µm) sowie das Verhältnis zwischen neuem Knochengewebe und nicht verknöchertem Gewebe (%) gemessen und verglichen. Für die statistische Auswertung wurden der Kruskal-Wallis- und Tukey-Test auf dem 0,05-Niveau angewendet.
Ergebnisse
Für alle histomorphometrischen Parameter wurden signifikante Unterschiede zwischen den Gruppen festgestellt. Das neue Knochenareal, der Knochen-Umfang, der Feret-Durchmesser und der Prozentsatz an neuem Knochengewebe waren in Gruppe III signifikant höher als in den anderen Gruppen (p<0,001). Histomorphometrische Messungen zeigten eine Verbesserung der Knochenarchitektur in der Gruppe mit systemisch zugeführtem Vitamin C. Die lokale Injektion beim Vergleich mit der Kontrollgruppe erbrachte jedoch signifikant niedrigere Ergebnisse hinsichtlich der Knochenbildung.
Schlussfolgerung
Systemische Applikation von Vitamin C während der frühen Phasen der Gaumennahtexpansion kann das Knochenwachstum stimulieren. Die lokale Injektion dieses Antioxidans in eine orthopädisch geweitete Sutur hat jedoch negative Auswirkungen auf die Knochenbildung.
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Uysal, T., Amasyali, M., Olmez, H. et al. Effect of vitamin C on bone formation in the expanded inter-premaxillary suture. Early bone changes. J Orofac Orthop 72, 290–300 (2011). https://doi.org/10.1007/s00056-011-0034-3
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DOI: https://doi.org/10.1007/s00056-011-0034-3